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The number you are referring to, 9600 rpm in this case, should be the max power output of the saw.
IME, forget the tach. I've seen two dealer "experts" use that method; the saw now runs great since I ran the H needle IN about 3/4 turn.(All adjustments should be made with warm engine.)The trick is to set the H needle so the engine 2-strokes cleanly @WOT in the cut AND starts to 4-stroke when you lift the bar slightly. You might, or might not, want to check what the tach tells you then, if only for giggles. That's as good as it gets. If it doesn't 4- stroke, go richer in small steps.That's essentially what "auto-tune" does- periodically makes minor H adjustments and retains them if rpm under load goes up, else back-tracks. (Don't pin me down onp tails.) Focus on rpm under load, not while screaming with no load.
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